Miniproposals

Miniproposal: Date Filed: Title: First Author: Session Leader: Steve Wukitch (shots 1-23)

Engineering Operator Run Comment

RF Conditioning; SL:Wukitch; PO:Mossessian; EO:Dekow/Fitzgerald

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:29:443PM

Author: To Be Determined

Engineering setup for Friday 19 July 2002 Session leader: S. Wukitch Physics operator: D. Mossessian ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00. Set up for possible ECDC in D2 between shots. Run begins at 10:00 and ends at 17:00. Power systems the same as for shot 1020716015. Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) fill B-side upper with 10 psi D2 Hybrid DISABLED (PG2) (for ECDC) fill C-side with 30 psi D2 Hybrid enabled (PG3) leave J-Bottom as is Hybrid DISABLED (PG5) Enable the following gate valves, assuming no vacuum problems: ECE ------------------------------------------------------------------------------- RF Setup: All 4 transmitters in Run On by 07:00. Purpose: Plasma conditioning of antennas ------------------------------------------------------------------------------- 001 plasma attempt after morning of RF vacuum conditioning request:lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.2 MW ramp @[1.2-1.5]sec E: 0.1 - 0.2 MW ramp @[0.9-1.2]sec J3: 0.1 - 0.2 MW ramp @[0.6-0.9]sec J4: 0.1 - 0.2 MW ramp @[0.6-0.9]sec digital phase is set to 225deg result: fizzle 002 request:lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.2 MW ramp @[1.2-1.5]sec E: 0.1 - 0.5 MW ramp @[0.9-1.2]sec J3: 0.1 - 0.2 MW ramp @[0.6-0.9]sec J4: 0.1 - 0.2 MW ramp @[0.6-0.9]sec digital phase is set to 225deg result: plasma D: faulted - out of tune E: 0.1-0.6 MW one fault but ramped nicely J: brief action: tune D raise E tune J 003 request:lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.2 MW ramp @[1.2-1.5]sec E: 0.3 - 0.8 MW ramp @[0.9-1.2]sec J3: 0.1 - 0.2 MW ramp @[0.6-0.9]sec J4: 0.1 - 0.2 MW ramp @[0.6-0.9]sec digital phase is set to 225deg result: plasma D: faulted - phase balance faults - DI34 appears bad E: 0.1-0.6 MW one fault but ramped nicely J: little longer - phase balance faults action: D: raise phase balance power threshold to 8800 from 8635 J: relax phase balance limit to 2000 from 1143 004 request:lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.2 MW ramp @[1.2-1.5]sec E: 0.3 - 0.8 MW ramp @[0.9-1.2]sec J3: 0.1 - 0.2 MW ramp @[0.6-0.9]sec J4: 0.1 - 0.2 MW ramp @[0.6-0.9]sec result: fizzle action: swap and test DI34 demod - swapped to 1033 notes: phase output fails before amplitude output is lost phase is lost ~-52 dBm input 005 request:lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.2 MW ramp @[1.2-1.5]sec E: 0.3 - 0.8 MW ramp @[0.9-1.2]sec J3: 0.1 - 0.2 MW ramp @[0.6-0.9]sec J4: 0.1 - 0.2 MW ramp @[0.6-0.9]sec result: fizzle 006 request:lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.2 MW ramp @[1.2-1.5]sec E: 0.3 - 0.8 MW ramp @[0.9-1.2]sec J3: 0.1 - 0.2 MW ramp @[0.6-0.9]sec J4: 0.1 - 0.2 MW ramp @[0.6-0.9]sec result: fizzle 007 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.2 MW ramp @[1.2-1.5]sec E: 0.3 - 0.8 MW ramp @[0.9-1.2]sec J3: 0.1 - 0.2 MW ramp @[0.6-0.9]sec J4: 0.1 - 0.2 MW ramp @[0.6-0.9]sec result: plasma D: faulted - phase balance faults E: 0.1-0.8 MW couple of faults but ramped nicely J: little longer - phase balance faults 008 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.2 MW ramp @[1.2-1.5]sec E: 0.3 - 0.8 MW ramp @[0.9-1.2]sec J3: 0.1 - 0.2 MW ramp @[0.6-0.9]sec J4: 0.1 - 0.2 MW ramp @[0.6-0.9]sec result: plasma D: faulted but longer - phase balance faults E: 0.1-0.8 MW couple of faults but ramped nicely J: little longer - phase balance faults action: D: lower power on D and change window to 1500 from 1143 change threshold to 9100 from 8950 E: repeat J: raise ramp power to 0.25-0.5 MW 009 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.2 MW ramp @[1.2-1.5]sec E: 0.3 - 0.8 MW ramp @[0.9-1.2]sec J3: 0.25-0.5 MW ramp @[0.6-0.9]sec J4: 0.25-0.5 MW ramp @[0.6-0.9]sec result: plasma D: faulted but longer - phase balance faults E: 0.1-0.8 MW couple of faults but ramped nicely J: little longer - phase balance faults action: D: change window to 2000 from 1500 change threshold to 9500 from 9100 E: repeat J: ramp power to 0.1-0.15 MW 010 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.2 MW ramp @[1.2-1.5]sec E: 0.3 - 0.8 MW ramp @[0.9-1.2]sec J3: 0.1-0.15 MW ramp @[0.6-0.9]sec J4: 0.1-0.15 MW ramp @[0.6-0.9]sec result: plasma D: faulted but longer - phase balance faults E: 0.1-0.8 MW couple of faults but ramped nicely J: little longer - phase balance faults action: D: change threshold to 9300 from 9100 E: repeat J: raise ramp power to 0.25-0.5 MW 011 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.2 MW ramp @[1.2-1.5]sec E: 0.3 - 0.8 MW ramp @[0.9-1.2]sec J3: 0.25-0.5 MW ramp @[0.6-0.9]sec J4: 0.25-0.5 MW ramp @[0.6-0.9]sec result: plasma D: much better E: 0.1-0.8 MW couple of faults J: some power - sparkles on the screen action: D: raise ramp to 0.3 MW E: repeat J: repeat 012 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.3 MW ramp @[1.2-1.5]sec E: 0.3 - 0.8 MW ramp @[0.9-1.2]sec J3: 0.25 MW ramp @[0.6-0.9]sec J4: 0.25 MW ramp @[0.6-0.9]sec result: plasma D: 0.1-0.3 MW with a couple of faults E: 0.1-0.8 MW couple of faults J: some power action: D: raise ramp to 0.5 MW E: repeat J: repeat 013 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.3 MW ramp @[1.2-1.5]sec E: 0.3 - 0.8 MW ramp @[0.9-1.2]sec J3: 0.25 MW ramp @[0.6-0.9]sec J4: 0.25 MW ramp @[0.6-0.9]sec result: plasma D: 0.1-0.3 MW with a couple of faults E: 0.3-0.8 MW couple of faults J: improving action: D: raise ramp to 0.8 MW E: repeat J: repeat 014 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.5 MW ramp @[0.6-0.9]sec E: 0.3 - 0.8 MW ramp @[0.9-1.2]sec J3: 0.25 MW @[1.2-1.5]sec J4: 0.25 MW @[1.2-1.5]sec result: plasma D: 0.1-0. MW with a couple of faults E: 0.1-0.8 MW couple of faults J: out of tune action: D: raise ramp to 0.8 MW E: raise ramp to 1.0 MW J: retune 015 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.8 MW ramp @[0.6-0.9]sec E: 0.3 - 1.0 MW ramp @[0.9-1.2]sec J3: 0.25 MW @[1.2-1.5]sec J4: 0.25 MW @[1.2-1.5]sec result: plasma D: 0.2-0.8 MW with a couple of faults E: 0.4-1.0 MW couple of faults J: out of tune action: D: repeat E: repeat J: retune 016 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.2 - 0.8 MW ramp @[0.6-0.9]sec E: 0.3 - 1.0 MW ramp @[0.9-1.2]sec J3: 0.25 MW @[1.2-1.5]sec J4: 0.25 MW @[1.2-1.5]sec result: plasma D: 0.2-0.8 MW with a couple of faults E: 0.4-1.0 MW couple of faults J: good match but still faulting action: D: repeat E: repeat J: repeat 017 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.2 - 0.8 MW ramp @[0.6-0.9]sec E: 0.3 - 1.0 MW ramp @[0.9-1.2]sec J3: 0.25 MW @[1.2-1.5]sec J4: 0.25 MW @[1.2-1.5]sec result: plasma D: 0.2-1.0 MW with a couple of faults E: 0.4-1.0 MW couple of faults J: good match but still faulting action: D: repeat and overlap late with E E: repeat and overlap late with D J: repeat 018 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.2 - 0.8 MW ramp @[0.6-0.9]sec, 0.5 MW @[1.35-1.5]sec E: 0.3 - 1.0 MW ramp @[0.9-1.2]sec, 0.5 MW @[1.35-1.5]sec J3: 0.25 MW @[1.2-1.5]sec J4: 0.25 MW @[1.2-1.5]sec result: plasma D: 0.2-1.0 MW with a couple of faults, ran overlapped E: 0.4-1.0 MW couple of faults. one fault when overlapped J: good match but still faulting action: D: repeat and raise power late E: repeat and raise power late J: repeat 019 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.2 - 0.8 MW ramp @[0.6-0.9]sec, 0.5 MW @[1.35-1.5]sec E: 0.3 - 1.0 MW ramp @[0.9-1.2]sec, 0.5 MW @[1.35-1.5]sec J3: 0.25 MW @[1.2-1.5]sec J4: 0.25 MW @[1.2-1.5]sec result: plasma D: 0.2-1.0 MW faults. ran overlapped E: 0.4-1.0 MW faults. ran overlapped J: good match but still faulting action: D: repeat E: repeat J: repeat 020 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.2 - 0.8 MW ramp @[0.6-0.9]sec, 0.5 MW @[1.35-1.5]sec E: 0.3 - 1.0 MW ramp @[0.9-1.2]sec, 0.5 MW @[1.35-1.5]sec J3: 0.25 MW @[1.2-1.5]sec J4: 0.25 MW @[1.2-1.5]sec result: plasma D: 0.2-1.0 MW with a couple of faults, ran overlapped E: 0.4-1.0 MW couple of faults. one fault when overlapped J: J4 appears to be the root of the faulting action: D: repeat E: repeat J: repeat 020 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.2 - 0.8 MW ramp @[0.6-0.9]sec, 0.7 MW @[1.35-1.5]sec E: 0.3 - 1.0 MW ramp @[0.9-1.2]sec, 0.7 MW @[1.35-1.5]sec J3: 0.25 MW @[1.2-1.5]sec J4: 0.25 MW @[1.2-1.5]sec result: plasma D: 0.2-1.0 MW faults E: 0.4-1.0 MW faults J: improvement action: D: repeat E: repeat J: repeat 021 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.2 - 0.8 MW ramp @[0.6-0.9]sec, 0.8 MW @[1.35-1.5]sec E: 0.3 - 1.0 MW ramp @[0.9-1.2]sec, 0.8 MW @[1.35-1.5]sec J3: 0.25 MW @[1.2-1.5]sec J4: 0.25 MW @[1.2-1.5]sec result: plasma D: 0.2-1.0 MW faults E: 0.4-1.0 MW faults J: improvement action: D: repeat E: repeat J: square up turn on 022 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.2 - 0.8 MW ramp @[0.6-0.9]sec, 0.8 MW @[1.35-1.5]sec E: 0.3 - 1.0 MW ramp @[0.9-1.2]sec, 0.8 MW @[1.35-1.5]sec J3: 0.25 MW @[1.2-1.5]sec J4: 0.25 MW @[1.2-1.5]sec result: plasma D: 0.2-1.0 MW faults E: 0.4-1.0 MW faults J: improvement action: D: 0.6 MW [.6-1.2] sec, 0.8 MW @[1.35-1.6] sec E: 0.6 MW [.6-1.2] sec, 0.8 MW @[1.35-1.6] sec J: repeat 023 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.6 MW [.6-1.2] sec, 0.8 MW @[1.35-1.6] sec E: 0.6 MW [.6-1.2] sec, 0.8 MW @[1.35-1.6] sec J3: 0.25 MW @[1.2-1.5]sec J4: 0.25 MW @[1.2-1.5]sec result: plasma D: 0.2-1.0 MW faults E: 0.4-1.0 MW faults J: phase balance faults prior to ops - noise problem note: DO NOT RUN 023 Summary: Antenna operation was significantly improved over 1020717. Before the run, the D and E-port were vacuum conditioned to 35 kV (0.5 sec) and the voltage and phase balance fault electronics were modified to eliminate oscillation in an instrumentation amplifier. D-port and E-port reached 20 kV and 25 kV respectively. They also operated to ~1.4 MW together. J-port had less vacuum conditioning and its operation into plasma reflected this fact. J-port at low power behaved very poorly and required a fast rise time (~1 msec to 100 kW) to avoid what appears to be discharge formation. D and E-port still require more vacuum and plasma conditioning. J-port requires significantly more vacuum conditioning and work on the phase feedback. NOTE: DO NOT RUN 1020719023 it will limit on the J-port antenna!

Physics Operator Summaries

Entered: Jul 7 2004 04:37:15:380PM

Author: To Be Determined

Physop summary for the run 1020719 (Friday, July 19, 2002) SL Wukitch PO Mossessian Goal: RF conditionning. Plan: Start by loading shot 1020717012, and let the RF go at it. Summary: The run started a little after 10 AM. First 6 shots were alternating fizzles/plasmas with vain attempts by PO to tweak the fields and gas to get better performance. Then the startup segment was loaded, developped by Ian on July 2, minor changes were done to gas and Bz, and after that every single shot was succesful without any intervention by PO. That allowed us to play with the plasma shape, changing upper and lower triangularities (keeping the outer gap constant for RF) and develop the shape we will use for JET identity experiments (lower delta =0.45, upper delta =0.4) and study the configuration with minimum triangularities that we need for planned EDA operational space experiment. It was found that minimum lower triangularity that can be achieved on C-Mod without moving outer strike point out of the lower divertor is around 0.45. The upper triangularity can be more or less safely decreased to the value of 0.2, but after that the shape becomes too close to double null and the upper outer strike point moves too far out of the divertor. When zero upper triangularity was programmed by mistake, the outer gap on top of the antennae decreased dramatically (although the midplane outer gap stayed at 1 cm) and the plasma visibly touched the upper edge of the J antenna. Therefore - PLEASE, DO NOT EVER ATTEMPT TO RUN SHOT 1020719023 ! JET identity shot - 1020719016 Good shot for starting triangularity scan - 1020719020 Recommendation for the next run - use startup segment from any shot starting from 1020719007 Overall: 23 shots 4 fizzles 19 plasmas ---------------------------------------------------------------------------------------- 1020719001 mossessian PHYSICS_OPERATOR Jul 19 2002 10:38:01:670AM The plan is the same as yesterday: Start by loading shot 1020717012, and let the RF go at it. Loaded 1020717012. Coldstart OK. Fizzle. For next shot: Br down 0.5 mT (offset 0.0015 -> 0.001), Bz up (IC_EF4 -1320 -> -1310), add gas to prepuff (pulse_gas4 20 ms -> 21 ms) ---------------------------------------------------------------------------- 1020719002 mossessian PHYSICS_OPERATOR Jul 19 2002 11:34:01:500AM . . . . . . . . . . . . . . . . . . . . Plasma. Nice startup, although strangly the gas pressure is a little lower than on shot 01 (with supposedly increased prepuff) For next shot: no PCS changes ----------------------------------------------------------------------------- 1020719003 mossessian PHYSICS_OPERATOR Jul 19 2002 11:34:14:906AM . . . . . . . . . . . . . . . . . . . . Plasma. Startup is not very good - almost did not make it. For next shot: drop Bz (IC_EF4 -1310 -> -1320) ----------------------------------------------------------------------------- 1020719004 mossessian PHYSICS_OPERATOR Jul 19 2002 11:35:28:730AM . . . . . . . . . . . . . . . . . . . . Fizzle. I made Bz more negative increasing the force that pushes plasma out, and it bounced from the outer wall. For next shot: IC_EF4 -1320 -> -1310. Also drop lower triangularity - in segment 2 RXL 0.011 -> 0.009 ----------------------------------------------------------------------------- 1020719005 mossessian PHYSICS_OPERATOR Jul 19 2002 12:03:22:030PM . . . . . . . . . . . . . . . . . . . . Fizzle. Bz jumped up 2 mT, gas dropped to 0.048. For next shot: Put Bz back where it was (IC_EF4 -1310 -> -1320), increased gas 21 -> 24 ms ----------------------------------------------------------------------------- 1020719006 mossessian PHYSICS_OPERATOR Jul 19 2002 12:16:13:080PM . . . . . . . . . . . . . . . . . . . . Fizzle. Next shot: Go to Ian's startup - load segment 1 from 1020702024. Changed Bz to -1320, gas to 24 ms (back to values in the previous shot's startup) ----------------------------------------------------------------------------- 1020719007 mossessian PHYSICS_OPERATOR Jul 19 2002 12:32:47:736PM . . . . . . . . . . . . . . . . . . . . PLasma. PLasma moves too far out, but recovers Next shot: No changes at startup. IN segment 2 - RXL 0.009 -> 0.013 to drop lower triangularity. ----------------------------------------------------------------------------- 1020719008 mossessian PHYSICS_OPERATOR Jul 19 2002 12:40:01:406PM . . . . . . . . . . . . . . . . . . . . PLasma. Next shot: No changes at startup. In segment 2 - RXL 0.013 -> 0.015 ----------------------------------------------------------------------------- 1020719008 mossessian PHYSICS_OPERATOR Jul 19 2002 12:57:39:376PM . . . . . . . . . . . . . . . . . . . . PLasma. Next shot: No changes at startup. In segment 2 - RXL 0.015 -> 0.025 ----------------------------------------------------------------------------- 1020719010 mossessian PHYSICS_OPERATOR Jul 19 2002 1:20:10:906PM . . . . . . . . . . . . . . . . . . . . Plasma. Disrupted at 1.09 s. Lower triangularity at that point is .41 and outer strike point is out of the outer divertor. For next shot: Move RXL back slightly, from 0.025 -> 0.022 ---------------------------------------------------------------------------- 1020719011 mossessian PHYSICS_OPERATOR Jul 19 2002 2:00:13:016PM . . . . . . . . . . . . . . . . . . . . Plasma. Lower delta is steady 0.44 from 0.5 to 1.5 s. Strike point is still a bit too high. Next shot: no startup changes. Bring RXL 2 more mm in 0.22 -> 0.2 ----------------------------------------------------------------------------- 1020719012 mossessian PHYSICS_OPERATOR Jul 19 2002 2:00:05:406PM . . . . . . . . . . . . . . . . . . . . Plasma. Lower delta is steady 0.46 from 0.5 to 1.5 s. Next shot: no startup changes. Bring RXL 1 mm out 0.2 -> 0.21, tweak RXU to get delta_upper=0.4 ----------------------------------------------------------------------------- 1020719013 mossessian PHYSICS_OPERATOR Jul 19 2002 2:12:58:656PM . . . . . . . . . . . . . . . . . . . . Plasma. Lower delta is steady 0.45 from 0.5 to 1.5 s. Delta_upper is ~ 0.34 Next shot: no startup changes. Tweak RXU to get delta_upper=0.4 ----------------------------------------------------------------------------- 1020719014 mossessian PHYSICS_OPERATOR Jul 19 2002 2:30:16:703PM . . . . . . . . . . . . . . . . . . . . Plasma. Delta_upper is ~ 0.36 Next shot: no startup changes. Tweak RXU to get delta_upper=0.4 ----------------------------------------------------------------------------- 1020719015 mossessian PHYSICS_OPERATOR Jul 19 2002 2:54:46:453PM . . . . . . . . . . . . . . . . . . . . Plasma. Delta_upper is ~ 0.38 Next shot: no startup changes. Tweak RXU to get delta_upper=0.4 ----------------------------------------------------------------------------- 1020719016 mossessian PHYSICS_OPERATOR Jul 19 2002 3:09:06:340PM . . . . . . . . . . . . . . . . . . . . Plasma. Delta_upper is ~ 0.4, delta_lower 0.45. Nice shot for JET identity Next shot: no startup changes. Tweak RXU to get delta_upper=0 (shot fro delta scan - Greenwald MP) ----------------------------------------------------------------------------- 1020719017 mossessian PHYSICS_OPERATOR Jul 19 2002 3:40:39:263PM . . . . . . . . . . . . . . . . . . . . Plasma. Delta_upper is ~ 0.3, delta_lower 0.45. Next shot: no startup changes. Tweak RXU to get delta_upper=0 (shot fro delta scan - Greenwald MP) ----------------------------------------------------------------------------- 1020719018 mossessian PHYSICS_OPERATOR Jul 19 2002 3:41:06:356PM . . . . . . . . . . . . . . . . . . . . Plasma. Delta_upper is ~ 0.3, delta_lower 0.47. Next shot: no startup changes. Tweak RXU to get delta_upper=0. Add density rampown after 1.5 s ----------------------------------------------------------------------------- 1020719019 mossessian PHYSICS_OPERATOR Jul 19 2002 4:41:08:550PM . . . . . . . . . . . . . . . . . . . . Plasma. Delta_upper is ~ 0.26 Next shot: no startup changes. Tweak RXU to get delta_upper=0. ----------------------------------------------------------------------------- 1020719020 mossessian PHYSICS_OPERATOR Jul 19 2002 4:42:03:863PM . . . . . . . . . . . . . . . . . . . . Plasma. Delta_upper is ~ 0.2 Next shot: no startup changes. Tweak RXU to get delta_upper=0. ----------------------------------------------------------------------------- 1020719021 mossessian PHYSICS_OPERATOR Jul 19 2002 4:42:22:630PM . . . . . . . . . . . . . . . . . . . . Plasma. Delta_upper is ~ 0.18 Next shot: no startup changes. Up RXU another 3 cm. Correct for ZXU negative slope towards the end of the shot. ----------------------------------------------------------------------------- 1020719022 mossessian PHYSICS_OPERATOR Jul 19 2002 4:59:21:740PM . . . . . . . . . . . . . . . . . . . . Plasma. Delta_upper is ~ 0.09. The ZXU moves down, the plasma is almost double null and the upper outer strike point is way out of the upper divertor. This is not a very good configuration. We will try to move the ZXU up. Next shot: no startup changes. ZXU up 2 cm ----------------------------------------------------------------------------- 1020719023 mossessian PHYSICS_OPERATOR Jul 19 2002 5:11:33:076PM . . . . . . . . . . . . . . . . . . . . Plasma. Delta_upper is ~ 0.03. It looks like I made a mistake and changed RXU instead of ZXU. As a result, the plasma touhes the upper part of J antenna. We do not want to run 0 upper triangularity ! -

Session Leader Comments
Jul 19 2002 10:58:38:370AM	1020719001	Steve Wukitch	001 plasma attempt after morning of RF vacuum conditioning request:lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.2 MW ramp @[1.2-1.5]sec E: 0.1 - 0.2 MW ramp @[0.9-1.2]sec J3: 0.1 - 0.2 MW ramp @[0.6-0.9]sec J4: 0.1 - 0.2 MW ramp @[0.6-0.9]sec digital phase is set to 225deg result: fizzle
Jul 19 2002 10:59:35:900AM	1020719002	Steve Wukitch	002 plasma attempt after morning of RF vacuum conditioning request:lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.2 MW ramp @[1.2-1.5]sec E: 0.1 - 0.5 MW ramp @[0.9-1.2]sec J3: 0.1 - 0.2 MW ramp @[0.6-0.9]sec J4: 0.1 - 0.2 MW ramp @[0.6-0.9]sec digital phase is set to 225deg result: plasma D: faulted - out of tune E: 0.1-0.6 MW one fault but ramped nicely J: brief
Jul 19 2002 11:18:38:980AM	1020719003	Steve Wukitch	003 request:lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.2 MW ramp @[1.2-1.5]sec E: 0.3 - 0.8 MW ramp @[0.9-1.2]sec J3: 0.1 - 0.2 MW ramp @[0.6-0.9]sec J4: 0.1 - 0.2 MW ramp @[0.6-0.9]sec digital phase is set to 225deg result: plasma D: faulted - phase balance faults - DI34 appears bad E: 0.1-0.6 MW one fault but ramped nicely J: little longer - phase balance faults action: D: raise phase balance power threshold to 8800 from 8635 J: relax phase balance limit to 2000 from 1143
Jul 19 2002 11:51:56:807AM	1020719004	Steve Wukitch	004 request:lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.2 MW ramp @[1.2-1.5]sec E: 0.3 - 0.8 MW ramp @[0.9-1.2]sec J3: 0.1 - 0.2 MW ramp @[0.6-0.9]sec J4: 0.1 - 0.2 MW ramp @[0.6-0.9]sec result: fizzle action: swap and test DI34 demod - swapped to 1033 notes: phase output fails before amplitude output is lost phase is lost ~-52 dBm input
Jul 19 2002 11:52:12:150AM	1020719005	Steve Wukitch	005 request:lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.2 MW ramp @[1.2-1.5]sec E: 0.3 - 0.8 MW ramp @[0.9-1.2]sec J3: 0.1 - 0.2 MW ramp @[0.6-0.9]sec J4: 0.1 - 0.2 MW ramp @[0.6-0.9]sec result: fizzle
Jul 19 2002 12:29:32:703PM	1020719006	Steve Wukitch	006 request:lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.2 MW ramp @[1.2-1.5]sec E: 0.3 - 0.8 MW ramp @[0.9-1.2]sec J3: 0.1 - 0.2 MW ramp @[0.6-0.9]sec J4: 0.1 - 0.2 MW ramp @[0.6-0.9]sec result: fizzle
Jul 19 2002 12:46:36:033PM	1020719007	Steve Wukitch	007 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.2 MW ramp @[1.2-1.5]sec E: 0.3 - 0.8 MW ramp @[0.9-1.2]sec J3: 0.1 - 0.2 MW ramp @[0.6-0.9]sec J4: 0.1 - 0.2 MW ramp @[0.6-0.9]sec result: plasma D: faulted - phase balance faults E: 0.1-0.8 MW couple of faults but ramped nicely J: little longer - phase balance faults
Jul 19 2002 12:46:47:157PM	1020719008	Steve Wukitch	008 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.2 MW ramp @[1.2-1.5]sec E: 0.3 - 0.8 MW ramp @[0.9-1.2]sec J3: 0.1 - 0.2 MW ramp @[0.6-0.9]sec J4: 0.1 - 0.2 MW ramp @[0.6-0.9]sec result: plasma D: faulted but longer - phase balance faults E: 0.1-0.8 MW couple of faults but ramped nicely J: little longer - phase balance faults action: D: lower power on D and change window to 1500 from 1143 change threshold to 9100 from 8950 E: repeat J: raise ramp power to 0.25-0.5 MW
Jul 19 2002 12:56:55:063PM	1020719009	Steve Wukitch	009 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.2 MW ramp @[1.2-1.5]sec E: 0.3 - 0.8 MW ramp @[0.9-1.2]sec J3: 0.25-0.5 MW ramp @[0.6-0.9]sec J4: 0.25-0.5 MW ramp @[0.6-0.9]sec result: plasma D: faulted but longer - phase balance faults E: 0.1-0.8 MW couple of faults but ramped nicely J: little longer - phase balance faults action: D: change window to 2000 from 1500 change threshold to 9500 from 9100 E: repeat J: ramp power to 0.1-0.15 MW
Jul 19 2002 02:03:38:953PM	1020719010	Steve Wukitch	010 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.2 MW ramp @[1.2-1.5]sec E: 0.3 - 0.8 MW ramp @[0.9-1.2]sec J3: 0.1-0.15 MW ramp @[0.6-0.9]sec J4: 0.1-0.15 MW ramp @[0.6-0.9]sec result: plasma D: faulted but longer - phase balance faults E: 0.1-0.8 MW couple of faults but ramped nicely J: little longer - phase balance faults action: D: change threshold to 9300 from 9100 E: repeat J: raise ramp power to 0.25-0.5 MW
Jul 19 2002 02:02:28:737PM	1020719011	Steve Wukitch	011 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.2 MW ramp @[1.2-1.5]sec E: 0.3 - 0.8 MW ramp @[0.9-1.2]sec J3: 0.25-0.5 MW ramp @[0.6-0.9]sec J4: 0.25-0.5 MW ramp @[0.6-0.9]sec result: plasma D: much better E: 0.1-0.8 MW couple of faults J: some power - sparkles on the screen action: D: raise ramp to 0.3 MW E: repeat J: repeat
Jul 19 2002 02:02:12:033PM	1020719012	Steve Wukitch	012 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.3 MW ramp @[1.2-1.5]sec E: 0.3 - 0.8 MW ramp @[0.9-1.2]sec J3: 0.25-0.5 MW ramp @[0.6-0.9]sec J4: 0.25-0.5 MW ramp @[0.6-0.9]sec result: plasma D: 0.1-0.3 MW with a couple of faults E: 0.1-0.8 MW couple of faults J: some power action: D: raise ramp to 0.5 MW E: repeat J: repeat
Jul 19 2002 02:26:41:137PM	1020719013	Steve Wukitch	013 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.3 MW ramp @[1.2-1.5]sec E: 0.3 - 0.8 MW ramp @[0.9-1.2]sec J3: 0.25 MW ramp @[0.6-0.9]sec J4: 0.25 MW ramp @[0.6-0.9]sec result: plasma D: 0.1-0.3 MW with a couple of faults E: 0.3-0.8 MW couple of faults J: improving action: D: raise ramp to 0.8 MW E: repeat J: repeat
Jul 19 2002 02:34:58:120PM	1020719014	Steve Wukitch	014 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.5 MW ramp @[0.6-0.9]sec E: 0.3 - 0.8 MW ramp @[0.9-1.2]sec J3: 0.25 MW @[1.2-1.5]sec J4: 0.25 MW @[1.2-1.5]sec result: plasma D: 0.1-0. MW with a couple of faults E: 0.1-0.8 MW couple of faults J: out of tune action: D: raise ramp to 0.8 MW E: raise ramp to 1.0 MW J: retune
Jul 19 2002 02:50:16:023PM	1020719015	Steve Wukitch	015 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.1 - 0.8 MW ramp @[0.6-0.9]sec E: 0.3 - 1.0 MW ramp @[0.9-1.2]sec J3: 0.25 MW @[1.2-1.5]sec J4: 0.25 MW @[1.2-1.5]sec result: plasma D: 0.2-0.8 MW with a couple of faults E: 0.4-1.0 MW couple of faults J: out of tune action: D: repeat E: repeat J: retune
Jul 19 2002 03:33:43:983PM	1020719016	Steve Wukitch	016 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.2 - 0.8 MW ramp @[0.6-0.9]sec E: 0.3 - 1.0 MW ramp @[0.9-1.2]sec J3: 0.25 MW @[1.2-1.5]sec J4: 0.25 MW @[1.2-1.5]sec result: plasma D: 0.2-0.8 MW with a couple of faults E: 0.4-1.0 MW couple of faults J: good match but still faulting action: D: repeat E: repeat J: repeat
Jul 19 2002 03:31:37:790PM	1020719017	Steve Wukitch	017 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.2 - 0.8 MW ramp @[0.6-0.9]sec E: 0.3 - 1.0 MW ramp @[0.9-1.2]sec J3: 0.25 MW @[1.2-1.5]sec J4: 0.25 MW @[1.2-1.5]sec result: plasma D: 0.2-1.0 MW with a couple of faults E: 0.4-1.0 MW couple of faults J: good match but still faulting action: D: repeat and overlap late with E E: repeat and overlap late with D J: repeat
Jul 19 2002 04:26:37:727PM	1020719018	Steve Wukitch	018 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.2 - 0.8 MW ramp @[0.6-0.9]sec, 0.5 MW @[1.35-1.5]sec E: 0.3 - 1.0 MW ramp @[0.9-1.2]sec, 0.5 MW @[1.35-1.5]sec J3: 0.25 MW @[1.2-1.5]sec J4: 0.25 MW @[1.2-1.5]sec result: plasma D: 0.2-1.0 MW with a couple of faults, ran overlapped E: 0.4-1.0 MW couple of faults. one fault when overlapped J: good match but still faulting action: D: repeat and raise power late E: repeat and raise power late J: repeat
Jul 19 2002 04:26:51:850PM	1020719019	Steve Wukitch	019 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.2 - 0.8 MW ramp @[0.6-0.9]sec, 0.5 MW @[1.35-1.5]sec E: 0.3 - 1.0 MW ramp @[0.9-1.2]sec, 0.5 MW @[1.35-1.5]sec J3: 0.25 MW @[1.2-1.5]sec J4: 0.25 MW @[1.2-1.5]sec result: plasma D: 0.2-1.0 MW faults. ran overlapped E: 0.4-1.0 MW faults. ran overlapped J: good match but still faulting action: D: repeat E: repeat J: repeat
Jul 19 2002 04:27:22:240PM	1020719020	Steve Wukitch	020 request: lower SN Ip~0.8 MA, BT~5.4 T, nl_04~1x10^20 m^-2 D: 0.2 - 0.8 MW ramp @[0.6-0.9]sec, 0.5 MW @[1.35-1.5]sec E: 0.3 - 1.0 MW ramp @[0.9-1.2]sec, 0.5 MW @[1.35-1.5]sec J3: 0.25 MW @[1.2-1.5]sec J4: 0.25 MW @[1.2-1.5]sec result: plasma D: 0.2-1.0 MW with a couple of faults, ran overlapped E: 0.4-1.0 MW couple of faults. one fault when overlapped J: J4 appears to be the root of the faulting action: D: repeat E: repeat J: repeat

Physics Operator Comments
Jul 19 2002 09:49:41:943AM		Dmitri Mossessian	The plan is the same as yesterday: Start by loading shot 1020717012, and let the RF go at it. The run will begin at 10 am. ECDC in D2 between shots. Power systems the same as for shot 1020717012. Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid DISABLED (PG1) fill B-side upper with 10 psi D2 Hybrid DISABLED (PG2) (for ECDC) fill C-side with 30 psi D2 Hybrid enabled (PG3) leave J-Bottom as is Hybrid DISABLED (PG5) Enable the following gate valves, assuming no vacuum problems: ECE
Jul 19 2002 10:38:01:670AM	1020719001	Dmitri Mossessian	The plan is the same as yesterday: Start by loading shot 1020717012, and let the RF go at it. Loaded 1020717012. Coldstart OK. Fizzle. For next shot: Br down 0.5 mT (offset 0.0015 -> 0.001), Bz up (IC_EF4 -1320 -> -1310), add gas to prepuff (pulse_gas4 20 ms -> 21 ms)
Jul 19 2002 11:34:01:500AM	1020719002	Dmitri Mossessian	Plasma. Nice startup, although strangly the gas pressure is a little lower than on shot 01 (with supposedly increased prepuff) For next shot: no PCS changes
Jul 19 2002 11:34:14:907AM	1020719003	Dmitri Mossessian	Plasma. Startup is not very good - almost did not make it. For next shot: drop Bz (IC_EF4 -1310 -> -1320)
Jul 19 2002 11:35:28:730AM	1020719004	Dmitri Mossessian	Fizzle. I made Bz more negative increasing the force that pushes plasma out, and it bounced from the outer wall. For next shot: IC_EF4 -1320 -> -1310. Also drop lower triangularity - in segment 2 RXL 0.011 -> 0.009
Jul 19 2002 12:03:22:030PM	1020719005	Dmitri Mossessian	Fizzle. Bz jumped up 2 mT, gas dropped to 0.048. For next shot: Put Bz back where it was (IC_EF4 -1310 -> -1320), increased gas 21 -> 24 ms
Jul 19 2002 12:16:13:080PM	1020719006	Dmitri Mossessian	Fizzle. Next shot: Go to Ian's startup - load segment 1 from 1020702024. Changed Bz to -1320, gas to 24 ms (back to values in the previous shot's startup)
Jul 19 2002 12:32:47:737PM	1020719007	Dmitri Mossessian	PLasma. PLasma moves too far out, but recovers Next shot: No changes at startup. IN segment 2 - RXL 0.009 -> 0.013 to drop lower triangularity.
Jul 19 2002 12:40:01:407PM	1020719008	Dmitri Mossessian	PLasma. Next shot: No changes at startup. In segment 2 - RXL 0.013 -> 0.015
Jul 19 2002 12:57:39:377PM	1020719008	Dmitri Mossessian	PLasma. Next shot: No changes at startup. In segment 2 - RXL 0.015 -> 0.025
Jul 19 2002 01:20:10:907PM	1020719010	Dmitri Mossessian	Plasma. Disrupted at 1.09 s. Lower triangularity at that point is .41 and outer strike point is out of the outer divertor. For next shot: Move RXL back slightly, from 0.025 -> 0.022
Jul 19 2002 02:00:13:017PM	1020719011	Dmitri Mossessian	Plasma. Lower delta is steady 0.44 from 0.5 to 1.5 s. Strike point is still a bit too high. Next shot: no startup changes. Bring RXL 2 more mm in 0.22 -> 0.2
Jul 19 2002 02:00:05:407PM	1020719012	Dmitri Mossessian	Plasma. Lower delta is steady 0.46 from 0.5 to 1.5 s. Next shot: no startup changes. Bring RXL 1 mm out 0.2 -> 0.21, tweak RXU to get delta_upper=0.4
Jul 19 2002 02:12:58:657PM	1020719013	Dmitri Mossessian	Plasma. Lower delta is steady 0.45 from 0.5 to 1.5 s. Delta_upper is ~ 0.34 Next shot: no startup changes. Tweak RXU to get delta_upper=0.4
Jul 19 2002 02:30:16:703PM	1020719014	Dmitri Mossessian	Plasma. Delta_upper is ~ 0.36 Next shot: no startup changes. Tweak RXU to get delta_upper=0.4
Jul 19 2002 02:54:46:453PM	1020719015	Dmitri Mossessian	Plasma. Delta_upper is ~ 0.38 Next shot: no startup changes. Tweak RXU to get delta_upper=0.4
Jul 19 2002 03:09:06:340PM	1020719016	Dmitri Mossessian	Plasma. Delta_upper is ~ 0.4, delta_lower 0.45. Nice shot for JET identity Next shot: no startup changes. Tweak RXU to get delta_upper=0 (shot fro delta scan - Greenwald MP)
Jul 19 2002 03:40:39:263PM	1020719017	Dmitri Mossessian	Plasma. Delta_upper is ~ 0.3, delta_lower 0.45. Next shot: no startup changes. Tweak RXU to get delta_upper=0 (shot fro delta scan - Greenwald MP)
Jul 19 2002 03:41:06:357PM	1020719018	Dmitri Mossessian	Plasma. Delta_upper is ~ 0.3, delta_lower 0.47. Next shot: no startup changes. Tweak RXU to get delta_upper=0. Add density rampown after 1.5 s
Jul 19 2002 04:41:08:550PM	1020719019	Dmitri Mossessian	Plasma. Delta_upper is ~ 0.26 Next shot: no startup changes. Tweak RXU to get delta_upper=0.
Jul 19 2002 04:42:03:863PM	1020719020	Dmitri Mossessian	Plasma. Delta_upper is ~ 0.2 Next shot: no startup changes. Tweak RXU to get delta_upper=0.
Jul 19 2002 04:42:22:630PM	1020719021	Dmitri Mossessian	Plasma. Delta_upper is ~ 0.18 Next shot: no startup changes. Up RXU another 3 cm. Correct for ZXU negative slope towards the end of the shot.
Jul 19 2002 04:59:21:740PM	1020719022	Dmitri Mossessian	Plasma. Delta_upper is ~ 0.09. The ZXU moves down, the plasma is almost double null and the upper outer strike point is way out of the upper divertor. This is not a very good configuration. We will try to move the ZXU up. Next shot: no startup changes. ZXU up 2 cm
Jul 19 2002 05:11:33:077PM	1020719023	Dmitri Mossessian	Plasma. Delta_upper is ~ 0.03. It looks like I made a mistake and changed RXU instead of ZXU. As a result, the plasma touhes the upper part of J antenna. We do not want to run 0 upper triangularity !

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	10:22:12:307AM	Plasma	Ok
2	10:39:56:583AM	Plasma	Ok
3	10:59:45:740AM	Plasma	Ok
4	11:16:14:913AM	Plasma	Ok
5	11:50:15:873AM	Plasma	Ok
6	12:05:20:860PM	Plasma	Ok
7	12:18:33:673PM	Plasma	Ok
8	12:32:06:593PM	Plasma	Ok
9	12:45:36:720PM	Plasma	Ok
10	01:01:11:627PM	Plasma	Ok
11	01:32:13:220PM	Plasma	Ok
12	01:51:26:267PM	Plasma	Ok
13	02:06:38:970PM	Plasma	Ok
14	02:23:37:863PM	Plasma	Ok
15	02:39:14:880PM	Plasma	Ok
16	02:56:40:380PM	Plasma	Ok
17	03:17:47:297PM	Plasma	Ok
18	03:33:32:467PM	Plasma	Ok
19	03:53:51:380PM	Plasma	Ok
20	04:10:13:473PM	Plasma	Ok
21	04:30:23:640PM	Plasma	Ok
22	04:44:39:777PM	Plasma	Ok
23	04:59:52:320PM	Plasma	Ok